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### Test 2 Cell Diagram

Posted: Tue Mar 12, 2019 11:23 pm
When do we use a comma for the cell diagram?
Do we also use a conductor when there is no solid present?

### Re: Test 2 Cell Diagram

Posted: Wed Mar 13, 2019 12:02 am
a) You use a comma when there are two species in the same phase. For example, if $Fe^{2+}$ is being oxidized to $Fe^{3+}$ in the anode, you use a comma to separate them in the cell diagram, instead of a vertical line.

b} Yes, you use a conductor (usually platinum) when no solid is present.

### Re: Test 2 Cell Diagram

Posted: Wed Mar 13, 2019 4:20 pm
Also, if there is a solid in the reaction, make sure it is conducting (metal). If not, we then add Pt(s).

### Re: Test 2 Cell Diagram

Posted: Wed Mar 13, 2019 5:03 pm
comma separates species in the same states

you have to add a conductor if there is no conducting metal or mercury Hg liquid or graphite I believe